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Thank you for creating this site! I am a Computer (Software) Engineering student and love to develop web applications in my free time. I am always looking to further my skillset and it seems this will prove really useful in understanding the choice of infrastructure/tools/languages by large companies.

Can anyone recommend any resources to better understand the interaction between the aforementioned choices (e.g. why would one company prefer a certain combination of language and infrastructure over a different combination)?

If you go to an individual company's page, you'll see references which may include a post/article about why they chose x over y. Tumblr's tech stack page (http://stackshare.io/tumblr/tumblr) has an article about why they chose Scala over other options and it's pretty neat.
Seems like the scanning may be broken. I just tried it with https://seatgeek.com and it says the site isn't public.
Eh, sorry. Should be fixed now. Try pasting in the URL
Nice site. I've been the user since it called leanstack.io . It's pretty useful!
I'm honestly surprised this hasn't been created before, really cool idea!
http://leanstack.io is very similar.

EDIT: Oh, leanstack.io now redirects to stackshare.io... So I guess this is a rebranding.

Interesting site. A valuable tool for startups and developers looking to expand their toolset.

Please make a shortcut for "I use this", so we can add technologies without navigating to their individual pages. I added 10 technologies off the top of my head but I keep being reminded of other ones I use and adding them involves a lot of clicking and back and forth.

Added to favourites!

Thanks for the feedback, will do! Currently, you have to add them to a stack or contribute/vote on content on their page. We'll definitely look into making that easier.
This is neat. One thing, would it be possible to show "verified" accounts? Meaning if someone puts up the stack that Twitter uses, how do I know for sure this isn't someone's guess and someone at Twitter actually posted it?
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First of all, thank you. It's great!

I'm interested in the 'business' aspect of this site. How do you plan to make profit ? How can you make people come back to the site when the stacks don't change that quickly ?

Dammit this was one of my startup ideas...oh well. Nice work btw. It might be interesting to group companies by industry. Considering I work in education, I would want to know what LMSs and CRMs are used by educational institutes for example.

Which raises another thought: wouldn't some organizations want to keep their stack secret from competitors, since a mature stack is usually the result of years of experienced decision-making.

"Browsing" button on the main page doesn't work for. Firefox on OSX.
Doesn't work in Nightly on Windows 8 either.
Didn't work for me in Chrome until I disabled (paused) Ghostery.
Sorry! Do you have javascript disabled? If so, you'll have a very hard time using the site because of how we're tracking events.
I never disable javascript. Also no Ghostery.
Doesn't work with HTTP Switchboard enabled on Chrome either. None of the links on the site do, which makes it a one-page site... ;)
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Where are the Windows stack components? For example, I don't believe Stack Overflow runs solely on Redis for their data storage.
This is great! I like being able to see so many different Utilities and DevOps tools being used. But it seems like many of the top stacks don't mention the application frameworks or languages that they're using. Why might that be the case?
This is great. I'll definitely show it to my students (undergrad Information Systems majors) who are trying to figure out what tools to learn.
When did IaaS/PaaS/SaaS products become part of the "stack?"
When did it not? I've been interviewing people for the past few weeks asking them about their stack and they all invariably say at one point "running on (aws|heroku|azure)". The [PaaS wiki entry](http://en.wikipedia.org/wiki/Platform_as_a_service) itself says it's providing a "solution stack" as a service.
Oh, neat. This will save me ~5 minutes of recon time if I ever need to do a pen-test for any of the companies that are submitted here. ;)
I've also been finding it useful to identify companies for product validation testing by seeing who uses various underlying components that are within my core demographic, combined with LinkedIn/moves.io to find someone to speak to.
I don't understand what is up with your site - this and the old LeanStack - but when I have Ghostery enabled I'm completely unable to click buttons. Mind taking a look at it maybe?
Sorry about that. We gather metrics on site usage so we can monitor how people are using the site. We're looking into a fix.
OK, guys, if you are watching me using your site then could you PLEASE announce that in a very big red block on the landing page or in a way that cookies are announced on many sites nowadays?

You should accept that usage monitoring is an inacceptable privacy invasion for many people nowadays and we would like to be informed about that kind of monitoring before using a site, so we can decide if we like it or not.

Do you really expect that any site doesn't watch you use their site?
Do you really expect any site to not use Google Analytics in this day and age?

Or am I talking to a troll (username)?

I also have this problem and I don't even use Ghostery. Just plain vanilla Firefox 32.0.3 on Windows 7 with Cookie Monster and AdBlock Plus.

Went so far as to allow cookies because that fouls up a lot of sites and this looks really interesting, but still no dice. I'll see if updating to 33.0.2 helps.

EDIT: Nope. Clicking any button still has no effect.

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Very cool! Right this morning I was looking at who's using django+mysql.

Can I ask you how accurate is the data and if/when it's "certified" from the source? From my morning search I found pinterest and rdio using both django and mysql, but this is not reflected in StackShare (missing mysql for pinterest, missing both django, mysql for rdio -- again, I'm not sure about my results, it's just a coincidence that I was searching that).

Thanks! Some stacks have more info than others for sure. The quality of the data will get better as more companies claim their pages and verify their stack (e.g. http://stackshare.io/mailgun/mailgun). For stacks that are not verified, we're inviting users to be community moderators and contributors to these pages to beef up the citations :)
Awesome, thank you for the details!
The front page's "Sign in with Github" doesn't work for me on Chrome/Linux (Chromium 37 on Ubuntu 14.04).
Awesome idea. Top Trumps for Software Stacks!